An armed robbery leads Gene to Chas Cale, a criminal he tried to bring down in Manchester. But when Chas reveals his alibi, Gene begins to wonder if he is past his prime as a DCI. Alex sends Ray and Chris undercover at the local pub in order to solve the case. But Gene is forced to come to the rescue when Alex's investigations end with her being tied up, gagged and left to die in an industrial freezer. Guest starring Phil Davis and Asa Butterfield